Mickey Rooney as Johnny Casar

Pat O'Brien as Father O'Hara

Beverly Tyler as Mary Reeves

James Brown as Allen

Ralph Dumke as Bruno Crystal

Milburn Stone as Jeff Davis

Bert Begley as Shilling

Marilyn Monroe as Polly

Sam Flint as Dr. Barton

Glenn Corbett as Mack Miller

John Hedloe as Ullman

James Anderson as Strong Arm Man (uncredited)

Al Hill as Policeman (uncredited)

Lois James as Roller Derby Girl (uncredited)

Kenner G. Kemp as Roller Derby Spectator (uncredited)

Frank Mills as Roller Derby Spectator (uncredited)